单项选择题

Whatever the causes, the English by the end of the year 2050 will have been more widely spoken and written than any other language ______.

A. ever was

B. had ever been
C. would ever be

D. has ever been

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单项选择题

By the first decade of the 21st century, international commercial air traffic is expected ______. vastly beyond today’s levels.

A. to have extended

B. being extended
C. to be extending

D. having been extended

单项选择题

Tom was glad that his success would ______ for those who would follow.

A. be easier

B. be easier to make
C. make it easier

D. make things easier

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